Definify.com

Webster 1913 Edition

Verb.

In a foul manner; filthily; nastily; shamefully; unfairly; dishonorably.

foully

wronged him; do forgive me, do.

Gay.

foul-mouthed

a witness never appeared in any cause.

Addison.

adv.

Filthily; nastily; hatefully; scandalously; disgracefully; shamefully.

I foully wronged him; do, forgive me, do.

Unfairly; not honestly.

Thou play'dst most foully for it.

foully ‎(comparative more foully, superlative most foully)